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Linux/arch/powerpc/sysdev/fsl_pmc.c

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  1 /*
  2  * Suspend/resume support
  3  *
  4  * Copyright 2009  MontaVista Software, Inc.
  5  *
  6  * Author: Anton Vorontsov <avorontsov@ru.mvista.com>
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  */
 13 
 14 #include <linux/init.h>
 15 #include <linux/types.h>
 16 #include <linux/errno.h>
 17 #include <linux/export.h>
 18 #include <linux/suspend.h>
 19 #include <linux/delay.h>
 20 #include <linux/device.h>
 21 #include <linux/of_platform.h>
 22 
 23 struct pmc_regs {
 24         __be32 devdisr;
 25         __be32 devdisr2;
 26         __be32 :32;
 27         __be32 :32;
 28         __be32 pmcsr;
 29 #define PMCSR_SLP       (1 << 17)
 30 };
 31 
 32 static struct device *pmc_dev;
 33 static struct pmc_regs __iomem *pmc_regs;
 34 
 35 static int pmc_suspend_enter(suspend_state_t state)
 36 {
 37         int ret;
 38 
 39         setbits32(&pmc_regs->pmcsr, PMCSR_SLP);
 40         /* At this point, the CPU is asleep. */
 41 
 42         /* Upon resume, wait for SLP bit to be clear. */
 43         ret = spin_event_timeout((in_be32(&pmc_regs->pmcsr) & PMCSR_SLP) == 0,
 44                                  10000, 10) ? 0 : -ETIMEDOUT;
 45         if (ret)
 46                 dev_err(pmc_dev, "tired waiting for SLP bit to clear\n");
 47         return ret;
 48 }
 49 
 50 static int pmc_suspend_valid(suspend_state_t state)
 51 {
 52         if (state != PM_SUSPEND_STANDBY)
 53                 return 0;
 54         return 1;
 55 }
 56 
 57 static const struct platform_suspend_ops pmc_suspend_ops = {
 58         .valid = pmc_suspend_valid,
 59         .enter = pmc_suspend_enter,
 60 };
 61 
 62 static int pmc_probe(struct platform_device *ofdev)
 63 {
 64         pmc_regs = of_iomap(ofdev->dev.of_node, 0);
 65         if (!pmc_regs)
 66                 return -ENOMEM;
 67 
 68         pmc_dev = &ofdev->dev;
 69         suspend_set_ops(&pmc_suspend_ops);
 70         return 0;
 71 }
 72 
 73 static const struct of_device_id pmc_ids[] = {
 74         { .compatible = "fsl,mpc8548-pmc", },
 75         { .compatible = "fsl,mpc8641d-pmc", },
 76         { },
 77 };
 78 
 79 static struct platform_driver pmc_driver = {
 80         .driver = {
 81                 .name = "fsl-pmc",
 82                 .owner = THIS_MODULE,
 83                 .of_match_table = pmc_ids,
 84         },
 85         .probe = pmc_probe,
 86 };
 87 
 88 static int __init pmc_init(void)
 89 {
 90         return platform_driver_register(&pmc_driver);
 91 }
 92 device_initcall(pmc_init);
 93 

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